Some bad words!

salaud (pronounced sa-lo), as a masculine adjective, means detestable, rotten:
c'est salaud ce que tu as fait là = that was a rotten thing to do (to me)

un salaud = a bastard
c'est qu'un salaud = he's an asshole
t'en as de la chance mon salaud! = you lucky bastard!
faire un coup de salaud à quelqu'un = to play somebody a dirty trick

the feminine noun is, in my opinion, slightly more insulting:
une salope = a bitch, a whore

As usual, use responsibly...